2020——2022英语周报高三新高考19期答案

第二节One possible versionFinally, as his sob quieted, his mother pulled back to look athim. " Rex, take the bird to Mr. Blake and tell him what happened.You will never have peace if you dont face him. Mr. Blakedeserves to know the truth she said with a firm look. The walk toMr. Blake's house was difficult. Leaving his mother in the yardRex stepped to the front door with the dead turkey. He knockedhoping Mr Blake wouldnt answer. But the door openedHi, Mr: blake, Rex handed him the dead bird. When he toldthe whole story of how he killed the turkey by mistake, Rex lookedat the ground, too frightened to look up there was a momentssilence and then Mr. Blake said, Thats all right. We'll eat it fordinner today. A smile appeared on his face. Rex couldnt believewhat he had heard. As he ran home he felt as if a rock had beenlifted from his shoulders. He realized that doing the right thing wastruly easy in the end

14.解：(1)物体B从释放到细绳刚绷直做自由落体运动，设细绳绷直前物体B的速度大小为v,绷直后A、B的共同速度大小为v共，A、B共同向下减速时的加速度大小为a,有2=2gh(2分)mBU=(mA十mB)哄(2分)哄2=2aH(2分)mA8一mBg=(mA十mB)a(2分)解得h=1.25m。(1分)(2)由(1)知当物体A第一次落地时，物体B的速度大小为~共=2/s,方向向上，此后物体B做竖直上抛运动，有h'=H+U2g(2分)解得h'=1.2m。(2分)3/m

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